Blindstitch sewing-machine.



H. C. MOULTON.

BLINDSTITCH SEWING MACHINE.

APPLICATION FILED JAN. 20. I915- Patented Feb.

3 SHEEISSHEET ll Jo Q Wlfnesses.

Inventor. y C- Moulion, bymz smfle ATIys.

Hurle H. C. MOULTON.

BLINDSTITCH SEWING MACHINE.

APPLICATION FILED JAN. 20. I915.

lnventor.

Patented Feb. 5, 1918.

v H. c. MOULTON. BLINDSTITCH SEWING MACHINE.

APPLICATION FILED JAN.20, l915.

Patented Feb. 5, 1918.

3 SHEETS-SHEET 3. F1g3.

I I I Fig. 4. 1

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naaaeae.

Application filed January 29, 1915. Serial No. 3,343.

To all whom it may concern:

Be it known that I, HARLEY C. MoUL'roN, a citizen of the United States,and resident of Dorchester, county of Suffolk, State of Massachusetts,have invented an Improvement in Blindstitch Sewingdl/Iachines, of

which the following description, in connection with the accompanyingdrawing, is a specification, like characters on the drawing representinglike parts.

This invention relates to improvements in blind stitch sewing machinesfor felling,

padding, and the like and particularly to .ing series of stitches cealedby folding over a novel form of bender mechanism operable in connectionwith a sewing machine having a reciprocating and laterally vibratingneedle.

In the usual blind stitch sewing machine having a reciprocating needleand complemental stitch forming mechanism when felling the bender isactuated upon every other stitch to raise the base layer of cloth intothe path of the needle so that the needle will penetrate and emerge fromthe upper surface of the base layer without passing through the same.

In alternating series of stitches the needle is shogged and upon itspenetrating stroke passes over the base layer entering the superimposedlayer beneath and back from the edge and emerging from the uppersurface'or. from the edge thereof. In such case the bender remainsdepressed beneath the work support during the formation of the stitch inthe superimposed layer.

The present invention contemplates the production of blind stitchingseams in which the needle in one series of stitches penetrates.

and emerges from the upper face of the base layer of fabric withoutpassing entirely through the fabric, and upon the alternatpenetrates andemerges from the upper face of the superimposed fabric, the seam thusproduced being conthe superimposed layer and pressing the same so thatthe edge of the fold overlies the stitching, thus forming a seam of thetype which is commonly used in attaching the bottom of the lining ofcoats to the body of the coat.

In making the seam by the mechanism disclosed herein the needle iscaused first to penetrate ,the base layer which is thrust upward by thebend r for that purpose,

Specification of Letters Patent.

' so that the BLINDSTITGH SEWIN G-MACHIN 1E.

Patented lFebmfi, IWJW.

then the needle is shogged laterally so that t will enter the upperimposed layera short distance backfrom the edgethereof, the base andsuperimposed layer being thrust upwardly by the bender ju'st suficientlyfor this purpose. When the seam is completed the superimposed layer isfolded beyond the stitching and pressed threads are entirely concealed.

In order to adapt this mechanism for different classes of work, that,is, different thicknesses in the base layer and ofthe superimposed layerit is essential that means be provided for independently adjusting thebender upon alternate thrusts so that the base layer maybe raisedtoasuficient height to permit the needle to penetrate Well into the sameupon one set of stitches and that it be raised to a less height upon thealternate stitches, so that the needle will merely penetrate thesuperimposed layer. So far asI am aware no mechanism has heretofore beendevised which will permit of or provide for the independent adjustmentof the thrust of the bender for difierent or alternate stitches.

One of-the objects of thisinvention therefore is to provide a blindstitch sewing machine havlng an oscillating and laterally vibratingneedle with bender mechanism which is adapted to thrust the benderthrough the. work plate to raise the material which is fed across thework plate into the path of the needle upon each penetrating stroke ofthe needle, wherein independent means are provided for adjusting theheight to which the bender is elevated upon alternate reciprocations.

Another object is to provide means lo- 'cated above the work support foradjusting the respective. heights to which the bender may be raised.

Another object of the invention is to provide means for actuating thebender in the manner above described through atoggle mechanism in whichthe toggle is straightin the annexed claims.

it C. MU'ULTON, 01E DORCHESTER, MASSACHUSETTS, ASSIG-NIJR T0 ARBETTERBOSTON, MASSACHUSETTS, A CORPORATION OF surface of the superbe pointedout- I ened' twice to project the bender through the i The invention isillustrated in the drawin s as ap lied to a. blind stitch sewing machinefor elling, of the Arbetter. type.

end of the base plate and the bender mechanism supported thereby.

The sewing machine illustrated. in the drawings comprises the usual bedplate- 1 having a standard 2 rising therefrom pro- 'vided with the usuallaterally extending arm .3 terminating in the head 4. The arm.

supports the usual main shaft 5 with its driving pulley 6 and hand Wheel7. The

. attached which carries the needle bar 14 .30 shaft12 is journaled in asleeve 16 connected driving shaft is provided at its front end with adisk 8 having an eceentrically disposed'stud or pin 9 connected by auniversal joint to an arm 11 of a rock shaft 12, to

the opposite end of which a collar 13 is for a curved oscillating needle15. The rock to an arm 17 of a shaft 18 which is suitably journaledinvertical bearings in the sewing machine head, the shaft 18 beingvibrated by suitable mechanism, not shown, to shog clamp the the needlelaterally for alternate stitches. Suitable complementary stitch formingmechanism may be provided, such as the rotary .hook mechanismillustrated in Fig. 2 in which a hook bracket 20 is adjustably securedby a slot and screw connection 21 to an extension 22 depending from thesewing ,machine head, the hook bracket carrying at its lower end theusual support for the hook 23'.

As illustrated herein an upper feeding mechanism is provided whichconsists of a feed dog 24 adjustably secured upon the end of a bar 25which is pivotally supported by a shaft journaled in a verticalreciprocatorybearing 26 and is actuated through a lever 27 by suitableand usual mechanism not shown.

A stationary presser foot 28 suitably sefrom the sewing machine headprovides means for limitingv the upward movement of aspring actuatedwork support 30 and forms one of the members which serve to work duringthe stitching operation.

Thework support 30 is desirably in the Q form of a. substantiallyrectangular plate carried upon a standard 31 journaled in suitablebearings 3233 in a bracket 34 which is secured by suitable screws 35-36side elevation of a sewing,

to flanges 37-38 depending from the under surface of the bed plateadjacent to the edges thereof.

The work supportis retained normally in elevated position by means of ahelical spring 39 surrounding the standard 31 and resting at its lowerend upon the journal 33 and at its upper end bearing upon the undersurface of a sleeve 40, having a laterally extending arm 41 which rideswithin a keeper 42. The sleeve is adjustably secured to the standard 31by a set screw 43 or other suitable fastener. The work support may belowered through the instrumentality of a knee lever, not shown,connected at one I end to the arm 44 of a bell crank lever, the

other arm 45 of which is provided with an offset lever 46 having anextension 47 overlying the upper edge of the arm 41 so that upon lateralpressure upon said knee lever the bell crank arm will be rocked in sucha manner as to depress the arm 41 and the collar40 and consequently thestandard 31 of the Work support.

V The mechanism thus far disclosed is of a usual character in blindstitch sewing machines of the Arbetter type.

The bender mechanism as illustrated herein comprises a bender 50 mountedin suitable bearings 51, 52 in the bracket 34 aforesaid, the benderbeing normally thrust to upwardly extended position, through a 'suitableaperture in the work plate, by

means of a spring 54 which engages at its upper end the base of thebender and at its lower end rests upon a stand 55. The stand 55 isyieldably supported upon a helical spring 56 which rests upon the end ofa hollow screw 58 seated in a boss 53 on the bracket 34. A guiding stem57 depending from the stand 54 and passing through the aperture in thescrew 58 serves 'to aid in maintaining the stand in proper positionwhile permitting vertical *thereof.

The bender desirably is raised, and lowered by toggle mechanism which isactuated through a countershaft carried beneath the base plate of themachine.- As illustrated herein a countershaft 60 .is journaled insuitable bearings 61 depending from or secured to the under surface ofthe bed plate, and is provided with a gear 62 meshing with a gear 63upon a vertical countershaft 64 which has at its upper end a beveledgear reciprocation r65 engaging a similar gear 66 upon the main shaft ofthe machine. ,1 As disclosed herein the gear 62 is twice as large indiameter as the gears 63, 65 and 66, so that the shaft 60 is driven atone revolution to every two revolutions of the main driving shaft.

In order to produce a reciprocation of the bender for every penetratingstroke of the needle it is therefore necessary that the togtataaaa gleshall be straightened'twice during every revolution of the countershaft60.

As illustrated in the drawings the bender 50 is provided with anadjustablesleeve 70 secured thereto by a set screw 71 the sleeve havingupon its side opposite to'said set screw a cylindrical extension or stud72 by means of which it is connected to the. up:

understood however that other by an arm 80 to an arm 81 which in turn isconnected to the crank 82 extending laterally from the crank disk 83secured to the end of the shaft 60. 25

In order to give the proper movement to the mechanism illustrated in thedrawing the pivotal shaft connecting the arms. 80 and 81 is extendedandpivotally connected to an arm 85 which is journaled upon a stud 86projecting laterally from a boss 87 on the inner side of the bracket 34.It is to be toggle arrangements may be made whereby the idle arm 85 maybe dispensed with:

I As the shaft 60 rotates the arm. 81 causes the oscillation of thetoggles through the arm 80 which connects to the pivot 79 of the togglelinks 73, 74 so'that upon each rotation of the shaft 60 the connectionof the toggle links 73, 74 crosses the vertical axial plane of thebender straightening the toggles and thrusting. the bender to theuppermost position provided for by said toggle. lit Wlll thus beobserved that whereas the shaft 60 rotates half as fast as the main thetoggle'is thrust upwardly twlce during every revolution of the shaftbender is thrust lip-- driving shaft 60 and consequently. the wardly forevery rotation of the mainshaft and consequently upon every penetratingstroke of the needle caused thereby. As before stated it is necessarythat the means he provided for regulatingthe height of the thrust forthe respective alternate serie(s1 of stitches which are laid in the basean to accomplish this end T have provided means for limiting the upwardthrust of the bender upon each straightening of the toggle. This isaccomplished in the preferred embodiment of the herein by providingmeans for limiting the u ward-movement of, the spring sup orteol otedl.

The pivotal joint 79 of the toggle links 73-74 is extended and isconnected superimposed layers respectively and a bracket 34 at inventionillustrated which the toggle link 74 1s piv The mechanism for limitingthe upward movement of the stand 55 during the reciprocation of thebender for its engagement with the main or base layer of fabric isaccomplished through the bell crank lever 90' 'pivotally mounted upon astud 91 projecting laterally from the rear side of the bracket 34, oneend 92 of said bell crank lever projecting over an ear 76 on the stand55, the other arm 93 of said lever being rejusta-ble stem 94 which maybe provided with set nuts 95 to engage the under surcessed to receivethe lower end of an ad-v face of the arm 93. The stem 94 desirablypasses through a boss or sleeve 96 depending from the main frame, and isscrew threaded at its upper end to engage a milled nut 97 located abovethe base plate of the machine. It will be obvious that by turning themilled nut 97 to the right the arm 93 of the bell crank lever will beraised and the limiting end 92 of said lever be depressed so that thebender will not be projected to its 'full height upon the straighteningof the toggle links. Upon the other hand if the milled nut 97 is rotatedto the left the arm 93 will be released so that the spring 56 whichsupports the shelf 55 will raise the stand 55 to a higher positionpermitting the bender to be thrust to a greater height above the planeof the work support upon the straightening of the toggle.

As before stated it is necessary to provide a separate adjustment forthe series of stitches in the superimposed layer so that the bender willnot thrust the work to such a high elevation as it does during thestroke of the needle which penetrates the base layer of the fabric. Inorder to accomplish. I

this result I have provided a special mechanism actuated through themedium of a cam upon the countershaft 60 which will depress the stand 55upon each alternate straightening'of the toggle which operates thebender.

T have also provided means for adjusting the highest-position to whichthe bender may be thrust during such operation. As illustrated hereinthis mechanism comprisesa bell crank lever 100 pivoted upon a stud 101extending rearwardly from the bracket 34, said lever 100 having an arm102 extending over a lip 103 projecting laterally from the stand 55. Theopposite arm of the bell crank lever is engaged by the end of anadjustable screw seated in the end of an arm 105 of the bellcrank leverwhich comprises a shaftltlfi journaled in a suitable bearing in one endand in a bracket 107 at the opposite/end. The shaft 106 is provided nearits opposite end at or adjacent tothe bracket 107 with an arm 108 whichrests upon the end of a lever 109 which is forked at its opposite end110 to embrace the dattened'end of a stem 111 of anadjustcentral portionof the lever 109 is engaged by a cam 114 secured to the shaft 60 adacent to the crank disk 78. I

A helical spring 115 connected at one end to a stud116 on the arm 102 ofthe bell crank I lever 100 and at itsother end to a stud 117 on themachine frame serves to hold thelimiting arm normally out of engagementwith the ledge 103 of the stand 55.

It will be obvious that the rotation of the milled sleeve 113 will serveto raise or lower the fulcrum of the lever 109 in respect to the camdisk 114 so that the amplitude of oscillation of the system of leversmay be varied and the highest position" assumed by the stand 55 duringthe stroke of the needle in the superimposed layer determined.

In the operation'of the machine the adjustments of the bender aforesaidmay be 7 regulated by the milled nut 97 so that the bender upon oneseries of its upward thrusts will. bend up a portion of the base layerof the fabricjust sufliciently to permit the needle upon its penetratingstroke to. enter and emerge from the upper surface of said base layerwithout passing through the entire layer. Adjustment may also beeffected through the milled nut 113 of the mechanism for limiting theuppermost position of the bender upon alternate penetrating strokes sothat the bender will raise the base and superimposed layers justsufficiently to permit the oscillating needle upon its alternate strokesto pass through the upper surface or so much as is desirable of thesuperimposed layer, without penetrating the base layer, so that a blindstitching seam for felling may be formed upon this machine with thebender rising at every penetrating stroke of the needle. I i s I Byreason of the ability tovary the thrust of the bender upon every seriesof movements the lining may be placed upon the bed'plate to form thebase layer as well as a heavier piece of fabric which is attachedthereto.

It will be obvious that the bender may be so adjusted as to projectequal distances through the work plate upon each oscillation of theneedle or that the bender mechanism may be so adjusted that the bendermay be projected a much greater distance upon one series of thrusts thanupon the alternate thrusts or may be rendered wholly ineffective uponalternate thrusts thus providing for a wide range of usefulness in blindstitching, padding and the like. 1

It is to be understood that the embodiment of my invention disclosedherein is illustrative merely and not restrictive and that other formsthereof may be constructed within the spirit of my invention.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is; I

1. A sewing machine comprising a work support, a reciprocating needleand complementary stitch forming mechanism located above the worksupport; means for feeding the work across said work support-in ad-'Vance of each penetrating stroke of the needle, a bender, means foractuating the same and independent means for adjusting the thrust of thebender upon alternate strokes. 2. In a blind stitch sewing machine forfelling a superimposed layer upon a base layer, a work support, areciprocating needle and complementary stitch forming mechanism locatedabove the work support, means port, a bender, means for actuating thesame and independently adjustable means for lim-,.

itin the thrust of the bender upon alternate stro es. I

4. In a blind stitch sewing machine for felling a superimposed layer.upon a base layer, a work support; a reci rocating needle andcomplementary stitch orming mecha-' nism located above the work support;means for feeding the work across the work support; means for vibratingthe needle to cause the same to reciprocate in different planes; a

bender, means for each penetrating means for varying.

actuating the same upon stroke of the needle and the thrust of thebender upon alternate strokes.

5. In ablind stitch sewing machine for felling a superimposed layer upona base layer, a work support; a curved ,o scillating needle andcomplementary stitch forming mechanism located above the work support;

' means for feeding the work across the work support;means for vibratingthe needle to cause the same to oscillate in different planes; a bender,means for actuating the same upon each penetrating stroke 0 the needleand means for adjusting the thrust of the bender to present the baselayer to the [needle to accommodate different thicknesses thereof.

6. In a blind stitch sewing machine for felling a superimposed layerupon a base layer, a work support; acurved oscillating needle andcomplementary stitch forming mechanism located above thework support;

means for feedin the work across the work support means or vibrating.the needle to cause the same to oscillate in different planes; a bender,means for actuating the tlltl naaaeaa same upon each penetrating strokeof the needle and independent means for adjusting the height of thealternate thrust of the bender to provide for blind stitching differentthicknesses of material in the base layer and also difi'erentthicknesses of material in the superimposed layer.

7. In a sewing machine comprising a work support, a curved oscillatingneedle and complemental stitch forming mechanism located above the Worksupport; means for feeding the work across the work support; means forvibrating the needle to cause the same to oscillate in difl'erentplanes; a bender, means for thrusting the same through the work supportto present the work to the needle comprising a toggle having one endconnected to the bender and i the other to a relatively stationary butad- $0 justable supporting stand and means for oscillating theconnection of the toggle links across the axial plane of the benderwhereby the same will be reciprocated twice during each full oscillationof the toggle.

8. In a blind stitch sewing machine comprising a work support, a curvedoscillating needle and complemental stitch forming mechanism locatedabove the work support; means for vibrating the needle to cause the sameto oscillate in did'erent planes, a bender, a toggle for actuating thesame having one arm connected to said bender and the other arm to ayieldable support, means to actuate said toggle and means to limit theupward position of the toggle support whereby the height of thrust ofthe bender will be adjusted.

9. lln a blind stitch sewing machine comprising a work support, a curvedoscillating needle and complemental stitch forming mechanism locatedabove the work support, means for vibrating the needle t6 cause the sameto oscillate in different planes, a bender, a toggle for actuating thesame having one arm connected to said bender and the other arm to ayieldable supporting stand. means for oscillating the joint of thetoggle upon opposite sides of the vertical axial plane of the bender andindependent means for limiting the uppermost position of the yieldablesupport upon each alternate reciprocation of the toggle.

10. A sewing machine comprising a work support, a curved needle andcomplementa stitch forming mech nism located above the work support; amain shaft and means connected thereto foroscillating said needle uponevery rotation of the shaft; a countershaft; means for rotating the samefrom said main shaft once upon every two revolutions of the main shaft:a bender and means connecting said bender to sai coun tershaft forcausing the bender to be reciprocated twice during each rotation of saidcountershaft and in synchronism with the oscillations of the needle, andindependent means for adjusting the height of thrust of the bender uponalternate thrusts.

11. A sewing machine comprising a work support; a curved needle andcomplementary stitch forming mechanism located above the Work support; amain shaft and means connected thereto for oscillating said needle uponevery rotation of the shaft; a countershaft; means for rotating the samefrom the main shaft once upon every two revolutions of the main shaft; abender, a toggle connected to said bender and to a relatively stationarysupport,'means for oscillating the joint of the toggle from saidcountershaft to cause the toggle to straighten twice during everyrevolution of said countershaft.

A sewing machine comprising a work support; a curved needle andcomplementary stitch forming mechanism located above the work support; amain shaft and means connected thereto for oscillatin said needle uponevery rotation of the shafl a countershaft; means for rotating the samefrom the main shaft once upon every two revolutions of the main shaft; abender; a toggle connected to said bender and to a .spring supportedstand; independent means for adjusting the highest position of saidalternate thrusts of the bender, and means connecting the joint of saidtoggle to said countershaft to cause the toggle to straighten twiceduring every revolution of the countershaft.

13. In a sewing machine for felling a, superimposed layer upon a baselayer, a work support; a curved needle and complemental stitch formingmechanism located above the work support; a-main shaft and meansconnected thereto for oscillating the needle upon every rotation of theshaft;

means for vibrating the needle to cause the same to oscillatealternately in difi'erent planes to engage the base layer and thesuperimposed layer respectively; a counter: shaft, means for rotatingthe same from said main shaft once u on every two revolutions of themain shafli; a bender; a toggle connected to said bender and a springsupstand upon ported stand; means actuated from the countershaft forreciprocating the joint of the toggle lever to thrust the bender throughthe work support twice upon everyv revolution of said countershaft;means for adjusting the uppermost position of the spring supported standduring the engagement of the bender with the base layer consisting of alever extending at one end over said standand the other end connected toa bolt having a milled nut located above the bed plate of the machine. t

M. A blind stitch sewing machine for felling comprising a work support,a curved oscillating needle and complemental stitch forming mechanismlocated upon the worlrmso support a main shaft and means connectedthereto for oscillating said needle uponevery rotation of said mainshaft; a-counters'haft;

meansfor rotating the'same from the main shaft once upon every tworevolutions of the main shaft; a bender; a toggle connected to saidbender'and to a spring supported stand; means for actuating said toggleto cause the bender to be thrust through the work support twice duringeach rotationof 7 said countershaft and in synchronism with theoscillation of the needle; means for'causing a different degree ofthrust by said bender during alternating stitches comprising a leverengaging said stand, a cam upon' work support; a main shaft and meansconnected thereto for oscillatin the needle upon every rotation of thesha means for vibrating the needle to cause the same to oscillatealternately in difi'erent planesl'to engage the base layer and thesuperimposed layer res ectively; .a countershaft; means for rotatmg thesame from. said main shaft once gage the last mentioned upon every tworevolutions of the main shaft; a bender; a toggle connected to saidbender and to the spring supported stand; means actuated from thecountershaft for reciprocating the joint of the toggle lever to thrustthe bender through the work support twice upon every revolution of saidcountershaft; means for adjusting the 'uppermost position of the benderduring its engagement with the work to position the superimposed layerin the path comprising a series of levers, one of which engages thespring supported stand and 3111 other of which is pivotall mounted upona stem adjustable by a mil ed nut extending through the bed plate of themachine; and a cam upon said countershaft adapted to enlever, wherebythe stand will be depressed a predetermined amount during the actuationof the bender to present the superimposed layer to the 'needle.

' In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

HARLEY C. MOULTON. Witnesses: FREDERICK A. TENNANT,

- THOMAS J. DBUMMONDJ I g of the needle

